A6-5400B vs Pentium G645

A6-5400B vs Pentium G645 Performance Spectrum

A6-5400B

2 / 2

1,465

+1.0%

Ryzen Threadripper PRO 3955WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Pentium G645

2 / 2

1,450

0.0%

About PassMark

PassMark CPU Mark evaluates processor speed through complex mathematical computations. It provides a reliable metric to compare multi-core performance, where higher scores indicate faster processing for multitasking, gaming, and heavy workloads.

A6-5400B vs Pentium G645 FPS Benchmarks

Predicted gaming performance across popular games. Tested paired with GeForce RTX 5090 to isolate CPU performance.

Search any supported game below to compare 1080p FPS for both components.

A6-5400B vs Pentium G645: Pros, Cons & Final Verdict

See where each CPU makes more sense in practice: gaming, heavier work, platform cost, power draw, and upgrade path.

A6-5400B

2012

Why buy it

✅Better for gaming: +5.0% higher average FPS across 49 shared CPU benchmark tests.
✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Radeon HD 7540D, while Pentium G645 needs a discrete GPU.
✅Includes a boxed cooler (Yes), unlike Pentium G645.

Trade-offs

❌Fewer obvious downsides in this matchup outside of normal market pricing swings.

Pentium G645

2012

Why buy it

Trade-offs

❌Worse for gaming: lower average FPS than A6-5400B across 49 shared CPU benchmark tests.
❌Lower PassMark (1,450 vs 1,465).
❌Launch MSRP is still $80 MSRP, while A6-5400B mostly shows up through inconsistent older-market listings.
❌No integrated graphics, while A6-5400B can still boot and troubleshoot without a discrete GPU.
❌No boxed cooler included, unlike A6-5400B.

Quick Answers

So, is A6-5400B better than Pentium G645?

Yes. A6-5400B is the better all-around CPU here. It gives you a 5.0% average FPS lead across 49 shared CPU game tests in our data, 1% better PassMark, and the stronger long-term platform, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, A6-5400B is the better pick. According to our tests, it delivers 5.0% more average FPS across 49 shared CPU game tests.

Which one is better for streaming, content creation, and heavy multitasking?

For streaming, content creation, and heavier multitasking, A6-5400B is the stronger fit. You are getting 1% better PassMark, backed by 2 cores and 2 threads.

Which one is the smarter buy today, not just the cheaper CPU?

A6-5400B is still the much better call for a fresh build. A6-5400B comes in at an unclear MSRP at unclear MSRP versus $80 MSRP, and it still gives you a 5.0% average FPS lead across 49 shared CPU game tests in our data. Pentium G645 only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2012 platform. Even with 100.0% better value on paper (18.1 vs 0.0 PassMark/$), it really only makes sense as a cheap stopgap or a niche existing-platform option for someone already on LGA1155.

Which one is more future-proof for 2026 and beyond?

A6-5400B makes more sense long term for 2026 and beyond. You are getting more multi-core headroom with 2 cores / 2 threads instead of 2/2. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

A6-5400B vs Pentium G645 Technical Specifications

Side-by-side specs, architecture details, clocks, memory, power, and platform differences.

A6-5400B

The A6-5400B is manufactured by AMD. It was released in 2014-01-01. It is based on the Trinity (2012−2013) architecture. It features 2 cores and 2 threads. Base frequency is 3.6 GHz, with boost up to 3.8 GHz. L3 cache: 0 kB. L2 cache: 1 MB (per core). Built on 32 nm process technology. Socket: FM2. Thermal design power (TDP): 65 Watt. Memory support: DDR3. Passmark benchmark score: 1,465 points. Launch price was $70.

Pentium G645

The Pentium G645 is manufactured by Intel. It was released in 2 September 2012 (13 years ago). It is based on the Sandy Bridge (2011−2013) architecture. It features 2 cores and 2 threads. Base frequency is 2.9 GHz, with boost up to 2.9 GHz. L3 cache: 3 MB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA1155. Thermal design power (TDP): 65 Watt. Memory support: DDR3. Passmark benchmark score: 1,450 points. Launch price was $80.

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Processing Power

Both the A6-5400B and Pentium G645 share an identical 2-core/2-thread configuration. Boost clocks reach 3.8 GHz on the A6-5400B versus 2.9 GHz on the Pentium G645 — a 26.9% clock advantage for the A6-5400B (base: 3.6 GHz vs 2.9 GHz). The A6-5400B uses the Trinity (2012−2013) architecture (32 nm), while the Pentium G645 uses Sandy Bridge (2011−2013) (32 nm). In PassMark, the A6-5400B scores 1,465 against the Pentium G645's 1,450 — a 1% lead for the A6-5400B. L3 cache: 0 kB on the A6-5400B vs 3 MB (total) on the Pentium G645.

Feature	A6-5400B	Pentium G645
Cores / Threads	2 / 2	2 / 2
Boost Clock	3.8 GHz+31%	2.9 GHz
Base Clock	3.6 GHz+24%	2.9 GHz
L3 Cache	0 kB	3 MB (total)
L2 Cache	1 MB (per core)+300%	256 kB (per core)
Process	32 nm	32 nm
Architecture	Trinity (2012−2013)	Sandy Bridge (2011−2013)
PassMark	1,465+1%	1,450
Geekbench 6 Single	380	—

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Memory & Platform

The A6-5400B uses the FM2 socket (PCIe 2.0), while the Pentium G645 uses LGA1155 (PCIe 2.0) — making them incompatible on the same motherboard.

Feature	A6-5400B	Pentium G645
Socket	FM2	LGA1155
PCIe Generation	PCIe 2.0	PCIe 2.0
Max RAM Speed	DDR3-1866	—
Max RAM Capacity	32 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	16	—

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Advanced Features

Virtualization: AMD-V (A6-5400B) / not specified (Pentium G645). The A6-5400B includes integrated graphics (Radeon HD 7540D), while the Pentium G645 requires a dedicated GPU. Primary use case: A6-5400B targets Business Desktop. Direct competitor: A6-5400B rivals Pentium G2020.